Patents by Inventor Bao Yang

Bao Yang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6392624
    Abstract: Method of driving a liquid crystal display such as a ferroelectric liquid crystal display by multiplex addressing. The display has a pair of bases. A transparent electrode layer and an orientation film are formed in this order on each base. The two bases are placed opposite to each other with a certain gap between them. A ferroelectric liquid crystal material is inserted in the gap. Let Vthlow be the voltage applied when the transmittivity of the liquid crystal material begins to change. Let Vthhigh be the voltage applied when the transmittivity of the liquid crystal material substantially assumes its maximum value. First and second select pulses of opposite polarities are applied to the liquid crystal material. Let Vs1 be the voltage of the first select pulse. Let Vs2 be the voltage of the second select voltage. This method is characterized in that Vs1=±(Vthlow−&Dgr;V), where &Dgr;V>0, and that Vs2=∓(Vthhigh+&Dgr;V), where &Dgr;V>0.
    Type: Grant
    Filed: February 8, 1995
    Date of Patent: May 21, 2002
    Assignee: Sony Corporation
    Inventors: Ying Bao Yang, Keiichi Nito, Akio Yasuda
  • Patent number: 6384887
    Abstract: A liquid crystal device comprises a pair of substrates and a liquid crystal provided between the paired substrates wherein domains whose threshold voltages are different from one another are finely distributed throughout the liquid crystal. In particular, the respective substrates each has a transparent electrode and an alignment film formed thereon in this order and the substrates are assembled to establish a given space therebetween, and a ferroelectric liquid crystal being injected into the given space wherein domains are finely distributed as set out above, thereby providing a a liquid crystal display device. The fine distribution is such that when a transmittance through inverted domains is 25%, the number of domains (microdomains) having a size of larger than 2 &mgr;m&phgr; in a field of 1 mm2 is not smaller than 300, preferably not smaller than 600, and the width of the threshold voltage within the domains is not smaller than 2 volts within a transmittance range of from 10 to 90%.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: May 7, 2002
    Assignee: Sony Corporation
    Inventors: Akio Yasuda, Keiichi Nito, Eriko Matsui, Hidehiko Takanashi, Ying-Bao Yang
  • Patent number: 6323919
    Abstract: A reflection type display having a front light comprises a light guide plate having a light incident portion to which the lights are introduced, a planar surface arranged on the surface facing said first substrate and a prismatic surface arranged on the other surface, said prismatic surface comprising pseudo-planar surfaces which are formed at an angle of approximately 0.5 to 3.5 degrees with said planar surface and are raised greater as being distanced away from said light incident portion and slanted surfaces which are formed at an angle of approximately 40 to 60 degrees with said planar surface and are descended greater as being distanced away from said light incident portion, said pseudo-planar surfaces and said slanted surfaces are arranged alternately to form multiple prisms.
    Type: Grant
    Filed: October 1, 1999
    Date of Patent: November 27, 2001
    Assignees: Sony Corporation, Stanley Electric Co., Ltd.
    Inventors: Ying Bao Yang, Osamu Ishige, Yoji Oki
  • Patent number: 6317111
    Abstract: A method of driving a liquid crystal device, which comprises matrix-addressed driving a liquid crystal device comprising a liquid crystal, particularly a ferroelectric liquid crystal, disposed between a pair of substrates and comprising finely distributed domains differing in threshold voltage for use in switching said liquid crystal, said method being a pulse modulation method comprising modulating at least one of pulse voltage and pulse width, a pixel electrode division method, or a time integration method. Also claimed is a liquid crystal device driven by any of said methods. The liquid crystal device provides a further improved analog multiple gray-scale level display, realizes a large-area display at a low cost, and enables drive at full color video rate.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: November 13, 2001
    Assignee: Sony Corporation
    Inventors: Keiichi Nito, Akio Yasuda, Hidehiko Takanashi, Ying Bao Yang
  • Publication number: 20010022636
    Abstract: A reflective display device includes a panel, a light guide plate and a light source. The panel is provided with a transparent first substrate lying on the side of the external incident light, a second substrate joined to the first substrate with a predetermined gap therebetween and lying on the reflection side, a guest-host liquid crystal layer held in the gap between the substrates, and electrodes provided on each substrate for applying a voltage to the guest-host liquid crystal layer. The light guide plate is composed of a transparent material and is arranged on the outside of the first substrate. The light source is arranged on the end of the light guide plate and generates illumination light as required. The light guide plate normally transmits external light onto the first substrate and emits the external light reflected from the second substrate, and also, as required, guides illumination light onto the first substrate and emits the illumination light reflected from the second substrate.
    Type: Application
    Filed: April 30, 2001
    Publication date: September 20, 2001
    Applicant: Sony Corporation
    Inventors: Ying Bao Yang, Tetsuo Urabe, Yukio Kinoshita, Hideo Kataoka, Takayuki Fujioka
  • Patent number: 6151089
    Abstract: A reflection type display device includes a panel, a light guide plate placed external to the panel, and a light source placed at the end of the light guide plate for generating illumination light as required. The light guide plate normally transmits external light onto a first substrate of the panel and emits the external light reflected from a second substrate of the panel, while, as required, guides illumination light onto the first substrate and emits the illumination light reflected from the second substrate. The light guide plate includes a planar section divided into bands and an inclined section lying between each planar section. The light guide plate reflects the illumination light guided from the light source at each inclined section so as to lead it onto the first substrate and emits the illumination light reflected from the second substrate through each planar section and inclined section.
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: November 21, 2000
    Assignee: Sony Corporation
    Inventors: Ying Bao Yang, Tetsuo Urabe, Yukio Kinoshita, Hideo Kataoka, Takayuki Fujioka
  • Patent number: 6108059
    Abstract: An illumination structure which is for viewing an image in a dark environment without deterioration of image quality in a bright environment is incorporated in a reflective display. A reflective display comprises a panel, a light guide plate, and a light source. The panel is provided with a transparent first substrate located on the incident side of the outside light, a second substrate bonded to the first substrate with interposition of a prescribed space and located on the side opposite to the first substrate, a liquid crystal layer held in the space between both substrates, and an electrode for applying a voltage to the liquid crystal layer. The light guide plate is placed on the outside of the first substrate. The light source is located on the end of the light guide plate, and emits the illumination light as required. The light guide plate allows the outside light to be transmitted, which is incident on the first substrate, and allows the outside light reflected on the second substrate to come out.
    Type: Grant
    Filed: March 8, 1999
    Date of Patent: August 22, 2000
    Assignee: Sony Corporation
    Inventor: Ying Bao Yang
  • Patent number: 6016133
    Abstract: A method of driving a liquid crystal device, which comprises matrix-addressed driving a liquid crystal device comprising a liquid crystal, particularly a ferroelectric liquid crystal, disposed between a pair of substrates and comprising finely distributed domains differing in threshold voltage for use in switching said liquid crystal, said method being a pulse modulation method comprising modulating at least one of pulse voltage and pulse width, a pixel electrode division method, or a time integration method. Also claimed is a liquid crystal device driven by any of said methods. The liquid crystal device provides a further improved analog multiple gray-scale level display, realizes a large-area display at a low cost, and enables drive at full color video rate.
    Type: Grant
    Filed: November 23, 1994
    Date of Patent: January 18, 2000
    Assignee: Sony Corporation
    Inventors: Keiichi Nito, Akio Yasuda, Hidehiko Takanashi, Ying Bao Yang
  • Patent number: 5926242
    Abstract: A reflective guest-host liquid-crystal display includes: a pair of upper and lower substrates joined together with a predetermined space therebetween; and a guest-host liquid-crystal layer which is held within the space and contains a dichroic dye. The upper substrate is provided with at least a counter electrode. At least thin-film transistors (TFTs), a reflective layer, a .lambda./4 phase shifter (quarter-wavelength plate), and pixel electrodes are formed on the lower substrate. The .lambda./4 phase shifter is formed above the TFTs and the reflective layer, and has contact holes connecting to the drain electrodes of the TFTs. The pixel electrodes are patterned on the .lambda./4 phase shifter and connected to the corresponding drain electrodes of the TFTs through the corresponding contact holes.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: July 20, 1999
    Assignee: Sony Corporation
    Inventors: Hideo Kataoka, Ying Bao Yang, Nobuyuki Shigeno, Tetsuo Urabe, Masaki Munakata